Process Control and Instrumentation
Which of the following does not figure in the list of seven substances selected for international temperature scale?

Antimony and silver (F.P)
Ice (F.P) and steam (B.P)
Oxygen and sulphur (B.P)
Zinc (B.P) and mercury (F.P)

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Process Control and Instrumentation
Time constant is the

Time required by the measured variable to reach 63.2% of its ultimate change
Time taken by the controlled variable to reach 63.2% of its full change
Same as transportation lag
Same as dead time

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